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Basis of Presentation - Additional Information (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Jan. 01, 2019 | Jan. 01, 2018
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating lease right-of-use assets | $ 34,428 |  |
Operating lease liabilities | $ 34,502 |  |
Cumulative effect of accounting change |  | $ (700) | $ 670
Accounting Standards Update 2016-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating lease right-of-use assets |  | 34,900 |
Operating lease liabilities |  | 34,400 |
Retained Earnings |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect of accounting change |  | (700) | $ 670
Retained Earnings | Accounting Standards Update 2016-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect of accounting change |  | $ (700) |

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